While I'm not at Dayton, I have been able to follow some of the announcements. Here's a quick list of the interesting ones so far!
The Elecraft KX2 - a smaller version of the KX3, 80 through 10m and fits in your hand, $750!
The DV4Home and D4Mobile radios - built from the DV4mini adapters, but full function radios. No prices or availability yet, but a great concept. I'll be interested in the reports from the show floor.
I'm not expecting anything big from Icom. Yaesu might announce something in an HF QRP rig, but I'm not that interested (I think they are still covered up trying to get Fusion/WIRES-X going like they want). I would think Flex will have something new to show, and there is still the nagging rumor that Kenwood will do something with a D-STAR radio. Even if you don't make the trek to Dayton, you can certainly find out a lot with a few Google searches or watching the Twitter feed!